i 3 4 LOUIS AGASSIZ. [CHAP. vi. 



kind. He carried no change of clothing, but added 

 shirt upon shirt, whenever he received a new one ; and 

 instead of appearing the rather slender man that he 

 was, he gradually assumed the appearance of a very 

 large and bulky workman. Indeed, he was constantly 

 taken for a quarryman or a mason. 



It was Gressly who collected all the materials for 

 Agassiz's Monograph of the Mya and Trigonia, and 

 also the majority of species of fossil echinoderms used 

 by Agassiz in his works on that family of sea-urchins, 

 and he also collected almost all the Jurassic and Neo- 

 comian fossil fishes. 



Agassiz was not a business man, but he had found in 

 Gressly one even less able to care for money matters, 

 so they lived in perfect harmony. But sickness came 

 to Gressly, who, after rallying, ended his life prema- 

 turely, at the age of fifty-one, in an insane asylum at 

 the Waldau, near Berne. Gressly's admiration and 

 respect for Agassiz lasted as long as his mind was 

 not obscured. 



It has been said that Desor wrote a large part of 

 the " Observations geologiques sur le Jura Soleurois," 

 and that Gressly was a pupil of Agassiz ; but this is 

 altogether a mistake. The manuscript of Gressly was 

 written during 1836 and 1837, in the library of Thur- 

 mann at Porrentruy. Thurmann was constantly asked 

 for help, which was always readily given, and read over 

 and corrected all the rather numerous Germanisms in 

 the French of Gressly. When Gressly started from 

 Porrentruy to go to Neuchatel, he carried with him his 

 manuscript, which was delivered into the hands of 



